1531234442 has 4 divisors (see below), whose sum is σ = 2296851666. Its totient is φ = 765617220.

The previous prime is 1531234427. The next prime is 1531234447. The reversal of 1531234442 is 2444321351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2444321351 = 47591 ⋅51361.

It can be written as a sum of positive squares in only one way, i.e., 1259611081 + 271623361 = 35491^2 + 16481^2 .

It is not an unprimeable number, because it can be changed into a prime (1531234447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382808609 + ... + 382808612.

Almost surely, 2^1531234442 is an apocalyptic number.

1531234442 is a deficient number, since it is larger than the sum of its proper divisors (765617224).

1531234442 is an equidigital number, since it uses as much as digits as its factorization.

1531234442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765617223.

The product of its digits is 11520, while the sum is 29.

The square root of 1531234442 is about 39130.9908129094. The cubic root of 1531234442 is about 1152.6051693732.

Adding to 1531234442 its reverse (2444321351), we get a palindrome (3975555793).

The spelling of 1531234442 in words is "one billion, five hundred thirty-one million, two hundred thirty-four thousand, four hundred forty-two".